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Re: compile issue and the -lz flag


Don Kehn <dekehn@xxxxxxxxx> writes:

> This is how I got it to work and there maybe an issue here:
> using the BUILD/compile-pentium64-max, changed the changed the
> extra_configs="$pentium_configs $max_configs $static_link" to
> extra_configs="$pentium_configs $max_configs" (notice the static_link is
> removed). It is trying to link with --all-static (thus it needs zlib.a
> libssl.a .....), which is a pain in the ars, I'm wondering if this is an
> issue for the build team. I believe this is the only *max that has the
> static_link. libtool ... uses --all-static which leads to the gcc -static
> ....-lz -lpthread, anything on the commandline after the -static MUST be
> statically linked thus is not found in my case. Have confirmed this on two
> different fedora core 10 - 64-bit systems.

Ah, thanks for digging up this, I think I understand now.

Probably on your system, you have libz.so but no libz.a.

The $static_link expands to

    --with-mysqld-ldflags=-all-static --with-client-ldflags=-all-static

These are extra linker flags added when linking specific executables. So they
are _not_ added generally to $LDFLAGS in configure.in (and anyway the checks
for --with-mysqld-ldflags and --with-client-ldflags are after the check for
libz in configure.in). So these flags are not used when checking for libz, and
hence ./configure decides it can use the system libz. But when it then gets to
actually link mysqld, it fails due to missing static library for libz.

So the BUILD/compile-pentium64-max script is probably not used much. For
development people generally will use BUILD/compile-pentium64-debug-max
instead, and the release builds are not made with the scripts in BUILD/.
That is probably the reason this has not been fixed yet.

So the work-around for you could be to just use
BUILD/compile-pentium64-debug-max, or remove the $static_link, or add

Still, it is a bug in configure.in that it wrongly decides to use the system
libz when that doesn't actually work when trying to link. It should use the
same flags when detecting libz as when actually linking the mysqld and other

So actually the libz check needs to do check 3 different linker options
(plain, adding --with-mysqld-ldflags, and adding --with-client-ldflags), and
only if system libz works in all three cases should it use that in preference
to the bundled.

I'll see if I can come up with a patch for this at some point, I may ask you
to test it later.

(Not sure how important this is. Linking mysqld statically was used
historically, but these days there are so many problems with fully static
binaries that it does not really work anymore. Still, I would like to get it
fixed, I strongly favour ./configure just doing the right thing, MariaDB
should compile out of the box on as many systems as possible).

Thanks again for your help in getting to the bottom of this!

 - Kristian.

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